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Common Stock (Tables) | 12 Months Ended
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Dec. 31, 2018
Common Stock [Abstract] |
Schedule of Common Stock Outstanding Roll Forward [Table Text Block] |
Authorized: Unlimited number of non-par value common shares. |  |  |  |  |  |
| 2018 |  | 2017
Issued and outstanding: | millions of shares | millions of Canadian dollars |  | millions of shares | millions of Canadian dollars
Balance, December 31, 2017 | 228.77 | $ | 5,601 |  | 210.02 | $ | 4,738
Conversion of Convertible Debentures | 0.01 |  | - |  | 0.15 |  | 6
Issuance of common stock (1) | 0.45 |  | 22 |  | 14.61 |  | 680
Issued under Purchase Plans at market rate | 4.87 |  | 200 |  | 3.89 |  | 182
Discount on shares purchased under Dividend Reinvestment Plan | - |  | (9) |  | - |  | (9)
Options exercised under senior management share option plan | 0.02 |  | 1 |  | 0.10 |  | 3
Employee Share Purchase Plan | - |  | 1 |  | - |  | 1
Balance, December 31, 2018 | 234.12 | $ | 5,816 |  | 228.77 | $ | 5,601
(1) In Q1 2018, Emera issued 0.45 million common shares to facilitate the creation and issuance of 1.8 million depository receipts in connection with the ICDU share acquisition. The depository receipts are listed on the Bahamas International Securities Exchange.

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- Definition Tabular disclosure of the change in common stock outstanding. + References No definition available. + Details
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